Dual clocked data bus - Patent 0347557

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(11)

EP 0 347 557 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	05.06.1991 Bulletin 1991/23

(43)	Date of publication A2:
	27.12.1989 Bulletin 1989/52

(21)	Application number: 89107432.0

(22)	Date of filing: 25.04.1989

(51)	International Patent Classification (IPC)⁴: G06F 13/42

(84)	Designated Contracting States:
	DE FR GB

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Priority:

24.06.1988 US 211032

(71)	Applicant: International Business Machines Corporation
	Armonk, N.Y. 10504 (US)

(72)	Inventors:
	Pechanek, Gerald George Endwell New York 13760 (US) Shippy, David James Endwell New York 13760 (US) Snedaker, Mark Carl Vestal New York 13850 (US) Woodward, Sandra Sue Endwell New York 13760 (US)

(74)	Representative: Jost, Ottokarl, Dipl.-Ing.
	IBM Deutschland Informationssysteme GmbH, Patentwesen und Urheberrecht D-70548 Stuttgart D-70548 Stuttgart (DE)

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References cited: :

(54)	Dual clocked data bus

(57) A synchronous parallel data bus particularly adapted for use in a data processing system where it is necessary to transfer data over long distances. The physical connection between communicating units includes a plurality of wires adapted to carry the parallel data signal and a wire which carries a clock signal to the remote unit. When data is transmitted from the remote unit to the base unit, the clock signal which originated at the base unit and was transmitted to the remote unit is "turned around" and transmitted back to the base unit for use in receiving the data from the remote unit.

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